Final answer:
Chaz was asked not to return to his college after being arrested in a police raid on a gay bar, upon which both his parents and the college's president were informed.
Step-by-step explanation:
Regarding the question about what happened to Chaz, the correct answer, based on the provided reference from William Koelsch, is that he was asked not to return to school. The specific event leading to this was Chaz's arrest during a police raid at a gay bar. After the police informed his parents and the college's president, the president instructed Chaz that he should not come back to the city college. This incident could represent the societal challenges and prejudices faced by individuals based on their sexuality during that era.